Regular games are now analyzed by very powerful AlphaGo-based bots, so you can instantly see which moves were wrong. This is a big improvement. It’s interesting how in some games with dan players the score flips a few times because the two players make awful mistakes that cancel out each other.
The same bots can be used in the tsumego section. The bots don’t really solve these problems, but they are exceptionally powerful and their guess is correct in 99.95% cases.
And the problems section can be a lot better and organized, really. Site members could have additional ratings for their tsumego solving skills and tsumego creating skills, i.e. problems that get high ratings increase the author’s reputation. Problems could have the comments section and so on.